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I am thinking of having another dyno done to see how much power was lost through worn rubber bushings

I can't imagine that changing RTABs and sub frame bushings would change your dyno readings. The car is ratcheted down on the dyno, and the suspension will only compress slightly as the car loads up, but the rollers on the dyno are smooth so there's nothing to upset the suspension.

Putting the power down through a corner on an uneven road... that's where you'll notice a difference.

I can't imagine that changing RTABs and sub frame bushings would change your dyno readings. The car is ratcheted down on the dyno, and the suspension will only compress slightly as the car loads up, but the rollers on the dyno are smooth so there's nothing to upset the suspension.

Putting the power down through a corner on an uneven road... that's where you'll notice a difference.

Engine, trans and diff bushing were all done too, and was referencing more, they dyno owner said factor 18% for the driveline in this car, compaired to 10% for a solid axle set up, I want to too see if there is a difference.

8% difference between IRS and SRA seems a bit far fetched IMO. I'm trying to picture swapping a SRA onto my E30 and gaining 15whp...that's significant. There's no way the back end of an IRS car is that inefficient. The only way I can see that happening would be if you were running the CV joints at some ridiculous angle.

Call they guy who owns the dyno that was at Bimmercruise and talk to him, he is the one who told me 18% loss factor. I felt it was a bit high myself, but he is the dyno expert and sure he knows more then most of us.